How hard can it be? DIY brake upgrades

RotorDad · 04-03-2010, 02:27 PM

Well I'm still interested the idea of the 4 pistons in the rear, sounds like a future mod for me. Nice work higgi.

hIGGI · 04-14-2010, 04:56 PM

brake lines done and handbrake feels just right with 3/4" cylinder....

MazdaMike · 04-19-2010, 07:39 PM

Why would you need such a massive bore master cylinder? Your just gonna have way too much pressure and lock um up too easy...I remember seeing a thread where a guy was experimenting with tons of different MCs I think he said 15/16s bore offered the best pedal feel and performance or it was the Subaru MC which I think was a a 1''.

hIGGI · 04-20-2010, 01:27 AM

MC should match total volume of brake calipers. If you upgrade to larger piston calipers (which i did by going brembos in front), your normaly firm brake pedal will become weak and pedal travel longer...upgrading to 929 MC with 1" solved this situation back then.

Now, upgrading rears from single to 4 piston is again enlarging piston area and volume of fluid, so going bigger MC might be again necessary. Of course, you wont loose your brakes by keeping stock MC, but feel will be different and its up to you if you how to solve it....

MazdaMike · 04-20-2010, 06:52 PM

Yessir I am familiar with Pascals law, but sorry I gapped and forgot you upgraded fronts too.

hIGGI · 04-26-2010, 09:24 AM

Took car (drove it 350km there and 350km back) to drift event in Slovakia, and brakes works great both on track and on the road, love them

04-03-2010, 02:27 PM	#31
RotorDad Big Ugly Join Date: Apr 2009 Location: Fredericksburg, Va iTrader: (1) Posts: 591 Rep Power: 16	Well I'm still interested the idea of the 4 pistons in the rear, sounds like a future mod for me. Nice work higgi. __________________ *Boosted Big Body On 335's* PS3 ID: Rotordad 1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect. 2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.

04-19-2010, 07:39 PM	#33
MazdaMike S4 Owner Join Date: Jun 2008 Location: Tottenham, ON, Canada iTrader: (0) Posts: 48 Rep Power: 0	Why would you need such a massive bore master cylinder? Your just gonna have way too much pressure and lock um up too easy...I remember seeing a thread where a guy was experimenting with tons of different MCs I think he said 15/16s bore offered the best pedal feel and performance or it was the Subaru MC which I think was a a 1''. __________________ 1985 Mazda RX7 GSL 13B, Holley etc 1997 Mazda MX6 LS - DD lowered on 17s Last edited by MazdaMike; 04-19-2010 at 07:42 PM..

04-20-2010, 06:52 PM	#35
MazdaMike S4 Owner Join Date: Jun 2008 Location: Tottenham, ON, Canada iTrader: (0) Posts: 48 Rep Power: 0	Yessir I am familiar with Pascals law, but sorry I gapped and forgot you upgraded fronts too. __________________ 1985 Mazda RX7 GSL 13B, Holley etc 1997 Mazda MX6 LS - DD lowered on 17s

04-14-2010, 04:56 PM	#32
hIGGI Rotary Fan in Training Join Date: Mar 2008 Location: Czech Republic iTrader: (0) Posts: 78 Rep Power: 17	brake lines done and handbrake feels just right with 3/4" cylinder....

04-20-2010, 01:27 AM	#34
hIGGI Rotary Fan in Training Join Date: Mar 2008 Location: Czech Republic iTrader: (0) Posts: 78 Rep Power: 17	MC should match total volume of brake calipers. If you upgrade to larger piston calipers (which i did by going brembos in front), your normaly firm brake pedal will become weak and pedal travel longer...upgrading to 929 MC with 1" solved this situation back then. Now, upgrading rears from single to 4 piston is again enlarging piston area and volume of fluid, so going bigger MC might be again necessary. Of course, you wont loose your brakes by keeping stock MC, but feel will be different and its up to you if you how to solve it....

04-26-2010, 09:24 AM	#36
hIGGI Rotary Fan in Training Join Date: Mar 2008 Location: Czech Republic iTrader: (0) Posts: 78 Rep Power: 17	Took car (drove it 350km there and 350km back) to drift event in Slovakia, and brakes works great both on track and on the road, love them